<?php
/**
 * Smarty plugin
 *
 * @package    Smarty
 * @subpackage PluginsModifier
 */

/**
 * Smarty regex_replace modifier plugin
 *
 * Type:     modifier<br>
 * Name:     regex_replace<br>
 * Purpose:  regular expression search/replace
 *
 * @link   http://smarty.php.net/manual/en/language.modifier.regex.replace.php
 *          regex_replace (Smarty online manual)
 * @author Monte Ohrt <monte at ohrt dot com>
 *
 * @param string       $string  input string
 * @param string|array $search  regular expression(s) to search for
 * @param string|array $replace string(s) that should be replaced
 *
 * @return string
 */
function smarty_modifier_regex_replace($string, $search, $replace) {
	if (is_array($search))
	{
		foreach ($search as $idx => $s)
		{
			$search[$idx] = _smarty_regex_replace_check($s);
		}
	}
	else
	{
		$search = _smarty_regex_replace_check($search);
	}

	return preg_replace($search, $replace, $string);
}

/**
 * @param  string $search string(s) that should be replaced
 *
 * @return string
 * @ignore
 */
function _smarty_regex_replace_check($search) {
	// null-byte injection detection
	// anything behind the first null-byte is ignored
	if (($pos = strpos($search, "\0")) !== false)
	{
		$search = substr($search, 0, $pos);
	}
	// remove eval-modifier from $search
	if (preg_match('!([a-zA-Z\s]+)$!s', $search, $match) && (strpos($match[1], 'e') !== false))
	{
		$search = substr($search, 0, -strlen($match[1])) . preg_replace('![e\s]+!', '', $match[1]);
	}

	return $search;
}

?>
